即使解决这些首次遇到的问题，以制度为基础的系统是否有效，还存在一些限制。
Even after these teething problems are resolved, there may be a limit to the efficiency of such a rules-based system.
单元格类型还有一个属性，它根据行、列和子网格限制表示这个单元格是否有效，见 图 7。
The cell type also has an attribute that represents whether the cell is valid based on the row, column, and grid requirements, as shown in Figure 7.
在您的项目中尽您最大努力尽早确定您将使用的基础架构是否对您造成了一些限制，它将影响您工作的有效性。
As best as you can, try to determine early in your project if the infrastructure you will be using poses any constraints on you that prevent you from being effective.
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